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Fair Value Measurements - Significant Unobservable Inputs - Derivative Contracts (Details) - Natural gas basis swaps - Fair Value Measurements Level 3
$ in Thousands
Sep. 30, 2016
USD ($)
$ / Mcf
Dec. 31, 2015
USD ($)
$ / Mcf
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation    
Fair Value | $ $ (170) $ (1,748)
Minimum    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation    
Natural gas basis differential forward curve (usd/mcf) (0.13) (0.06)
Maximum    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation    
Natural gas basis differential forward curve (usd/mcf) (0.25) (0.28)
Weighted Average    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation    
Natural gas basis differential forward curve (usd/mcf) (0.20) (0.22)